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不同栅氧退火工艺下的SiC MOS电容及其界面电学特性
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作者 付兴中 刘俊哲 +4 位作者 薛建红 尉升升 谭永亮 王德君 张力江 《半导体技术》 CAS 北大核心 2025年第1期32-38,共7页
SiC MOS电容的电学特性和栅氧界面特性是评价和改进SiC MOS器件制造工艺的重要依据。通过依次测试SiC MOS器件的氧化物绝缘特性、界面态密度、偏压温度应力不稳定性(偏压温度应力条件下的平带电压漂移)、氧化物陷阱电荷密度和可动电荷... SiC MOS电容的电学特性和栅氧界面特性是评价和改进SiC MOS器件制造工艺的重要依据。通过依次测试SiC MOS器件的氧化物绝缘特性、界面态密度、偏压温度应力不稳定性(偏压温度应力条件下的平带电压漂移)、氧化物陷阱电荷密度和可动电荷密度的方法,对分别经过氮等离子体氧化后退火(POA)处理、氮氢混合等离子体POA处理、氮氢氧混合等离子体POA处理、氮氢氯混合等离子体POA处理的SiC MOS电容的电学特性和栅氧界面特性进行了分析。结果表明,该方法可以系统地评价SiC MOS电容电学特性和栅氧界面特性,经过氮氢氯混合等离子体POA处理的SiC MOS电容可以满足高温、大场强下长期运行的性能指标。 展开更多
关键词 SiC moS电容 氧化后退火(POA) 平带电压漂移 氧化物陷阱电荷 可动电荷
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Molybdenum isotope composition of the upper mantle and its origin:insight from mid-ocean ridge basalt
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作者 Shuo CHEN 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第3期705-708,共4页
The molybdenum(Mo)isotope system is pivotal in reconstructing marine redox changes throughout Earth’s history and has emerged as a promising tracer for igneous and metamorphic processes.Understanding its composition ... The molybdenum(Mo)isotope system is pivotal in reconstructing marine redox changes throughout Earth’s history and has emerged as a promising tracer for igneous and metamorphic processes.Understanding its composition and variation across major geochemical reservoirs is essential for its application in investigating high-temperature processes.However,there is debate regarding theδ^(98/95)Mo value of the Earth’s mantle,with estimates ranging from sub-chondritic to super-chondritic values.Recent analyses of global mid-ocean ridge basalt(MORB)glasses revealed significantδ^(98/95)Mo variations attributed to mantle heterogeneity,proposing a two-component mixing model to explain the observed variation.Complementary studies confirmed the sub-chondriticδ^(98/95)Mo of the depleted upper mantle,suggesting remixing of subduction-modified oceanic crust as a plausible mechanism.These findings underscore the role of Mo isotopes as effective tracers for understanding dynamic processes associated with mantle-crustal recycling. 展开更多
关键词 molybdenum(mo)isotope MANTLE crustal recycling mid-ocean ridge basalt(moRB)
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Measurement of 2p-3d absorption in a hot molybdenum plasma
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作者 Gang Xiong Bo Qing +17 位作者 Zhiyu Zhang Longfei Jing Yang Zhao Minxi Wei Yimeng Yang Lifei Hou Chengwu Huang Tuo Zhu Tianming Song Min Lv Yan Zhao Yuxue Zhang Guohong Yang Zeqing Wu Jun Yan Yaming Zou Jiyan Zhang Jiamin Yang 《Matter and Radiation at Extremes》 SCIE EI CSCD 2024年第4期68-79,共12页
We present measurements of the 2p-3d transition opacity of a hot molybdenum-scandium sample with nearly half-vacant molybdenum M-shell configurations.A plastic-tamped molybdenum-scandium foil sample is radiatively hea... We present measurements of the 2p-3d transition opacity of a hot molybdenum-scandium sample with nearly half-vacant molybdenum M-shell configurations.A plastic-tamped molybdenum-scandium foil sample is radiatively heated to high temperature in a compact D-shaped gold Hohlraum driven by∼30 kJ laser energy at the SG-100 kJ laser facility.X rays transmitted through the molybdenum and scandium plasmas are diffracted by crystals and finally recorded by image plates.The electron temperatures in the sample in particular spatial and temporal zones are determined by the K-shell absorption of the scandium plasma.A combination of the IRAD3D view factor code and the MULTI hydrodynamic code is used to simulate the spatial distribution and temporal behavior of the sample temperature and density.The inferred temperature in the molybdenum plasma reaches a average of 138±11 eV.A detailed configuration-accounting calculation of the n=2–3 transition absorption of the molybdenum plasma is compared with experimental measurements and quite good agreement is found.The present measurements provide an opportunity to test opacity models for complicated M-shell configurations. 展开更多
关键词 molybdenum ABSORPTION CONFIGURATION
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Robust T_c in element molybdenum up to 160 GPa
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作者 吴新月 郭淑敏 +8 位作者 郭鉴宁 陈诉 王煜龙 张可欣 朱程程 刘晨晨 黄晓丽 段德芳 崔田 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期188-193,共6页
Element superconductors with the single atoms provide clean and fundamental platforms for studying superconductivity.Although elements with d electrons are usually not favored by conventional BCS,the record supercondu... Element superconductors with the single atoms provide clean and fundamental platforms for studying superconductivity.Although elements with d electrons are usually not favored by conventional BCS,the record superconducting critical temperature(T_(c))in element scandium(S_(c))has further ignited the intensive attention on transition metals.The element molybdenum(M_o)with a half-full d-orbital is studied in our work,which fills the gap in the study of Mo under high pressure and investigates the pressure dependence of superconductivity.In this work,we exhibit a robust superconductivity of Mo in the pressure range of 5 GPa to 160 GPa via high-pressure electrical transport measurements,the T_(c) varies at a rate of0.013 K/GPa to 8.56 K at 160 GPa.Moreover,the superconductivity is evidenced by the T_(c) shifting to lower temperature under applied magnetic fields,and the upper critical magnetic fields are extrapolated by the WHH equation and GL equation;the results indicate that the maximum upper critical magnetic field is estimated to be 8.24 T at 137 GPa.We further investigate the superconducting mechanism of Mo,the theoretical calculations indicate that the superconductivity can be attributed to the strong coupling between the electrons from the partially filled d band and the phonons from the frequency zone of 200-400 cm^(-1). 展开更多
关键词 molybdenum element superconductor high pressure SUPERCONDUCTIVITY
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Ethoxylated molybdenum disulphide based nanofluid for enhanced oil recovery
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作者 Infant Raj Zhuo Lu +2 位作者 Ji-Rui Hou Yu-Chen Wen Li-Xiao Xiao 《Petroleum Science》 SCIE EI CAS CSCD 2024年第5期3417-3427,共11页
Despite advances in renewable energy sources, the world's current infrastructure and consumption patterns still heavily depend on crude oil. Enhanced oil recovery(EOR) is a crucial method for significantly increas... Despite advances in renewable energy sources, the world's current infrastructure and consumption patterns still heavily depend on crude oil. Enhanced oil recovery(EOR) is a crucial method for significantly increasing the amount of crude oil extracted from mature and declining oil fields. Nanomaterials have shown great potential in improving EOR methods due to their unique properties, such as high surface area, tunable surface chemistry, and the ability to interact at the molecular level with fluids and rock surfaces. This study examines the potential use of incorporating ethoxylated molybdenum disulfide with a unique three-dimensional flower-like morphology for overcoming the challenges associated with oil recovery from reservoirs characterized by complex pore structures and low permeability. The synthesized nanomaterial features a chemical composition that encompasses a polar ethoxy group linking molybdenum disulfide nanosheets and an alkylamine chain. The ethoxy group promotes interactions with water molecules through hydrogen bonding and electrostatic forces, disrupting the cohesive forces among water molecules and reduction surface tension at the oil-water interface. As a result, the nanomaterial achieves an ultra-low interfacial tension of 10^(-3) mN/m. Core flooding experiments demonstrate a significant oil recovery of approximately 70% at a concentration as low as 50 ppm. This research paves the way for the design and synthesis of advanced extended surfactant-like nanomaterials,offering a promising avenue for enhancing oil recovery efficiency. 展开更多
关键词 molybdenum disulfide NANOFLUID Flow in porous media Core flooding Interfacial tension
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Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching
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作者 Fengjuan Zhang Chenhui Liu +2 位作者 Srinivasakannan Chandrasekar Yingwei Li Fuchang Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CSCD 2024年第1期91-105,共15页
The preparation process of sodium molybdate has the disadvantages of high energy consumption,low thermal efficiency,and high raw material requirement of molybdenum trioxide,in order to realize the green and efficient ... The preparation process of sodium molybdate has the disadvantages of high energy consumption,low thermal efficiency,and high raw material requirement of molybdenum trioxide,in order to realize the green and efficient development of molybdenum concentrate resources,this paper proposes a new process for efficient recovery of molybdenum from molybdenum concentrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali leaching.Thermodynamic analysis indicated the feasibility of oxidation roasting of molybdenum concentrate.The effects of roasting temperature,holding time,and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na_(2)MoO_(4)·2H_(2)O) were investigated.Under the optimal process conditions:roasting temperature of 700℃,holding time of 110 min,and power-to-mass ratio of 110 W/g,the molybdenum state of existence was converted from MoS_(2) to Mo O3.The process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated,the optimal leaching conditions include a solution concentration of 2.5 mol/L,a liquid-to-solid ratio of 2 mL/g,a leaching temperature of 60℃,and leaching solution termination at pH 8.The optimum conditions result in a leaching rate of sodium molybdate of 96.24%.Meanwhile,the content of sodium molybdate reaches 94.08wt%after leaching and removing impurities.Iron and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate solution.This research avoids the shortcomings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate,which provides a new idea for the highvalue utilization of molybdenum concentrate. 展开更多
关键词 molybdenum metallurgy microwave oxidation roasting removing impurities sodium hydroxide leaching
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Enhanced mechanical properties of molybdenum alloy originating from composite strengthening of Re and CeO_(2)
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作者 Meng-yao ZHANG Shuai MA +3 位作者 Xin LI Ye GAO Zhuang-zhi WU De-zhi WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第10期3295-3308,共14页
To enhance the mechanical properties of molybdenum alloys at both room and high temperatures,Mo-14Re-1CeO_(2)alloy was synthesized using the powder metallurgy method,and the corresponding microstructure and mechanical... To enhance the mechanical properties of molybdenum alloys at both room and high temperatures,Mo-14Re-1CeO_(2)alloy was synthesized using the powder metallurgy method,and the corresponding microstructure and mechanical properties were characterized.The results indicate that the ultimate tensile strength of Mo-14Re-1CeO_(2)reaches 657 MPa,with a total elongation of 35.2%,significantly higher than those of pure molybdenum(453 MPa,and 7.01%).Furthermore,the compression strength of Mo-14Re-1CeO_(2)at high temperature(1200℃)achieves 355 MPa,which is still larger than that of pure molybdenum(221 MPa).It is revealed that there is a coherent interface between CeO_(2)and the Mo-14Re matrix with CeO_(2)particles uniformly distributed in both intergranular and intragranular regions.The improvements in mechanical properties are primarily attributed to the formation of Mo-Re solid solution,grain refinement,and dispersion strengthening effect of CeO_(2). 展开更多
关键词 molybdenum−rhenium alloy cerium oxide composite strengthening mechanical properties
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Multiscale confinement nitridation in molybdenum carbide for efficient hydrogen production
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作者 Liming Dai Chenchen Fang +10 位作者 Xiaoyuan Zhang Xuefeng Xu Xuanxuan Chen Xinyue Zong Xueming Hu Wenyao Zhang Liang Xue Pan Xiong Yongsheng Fu Jingwen Sun Junwu Zhu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第7期61-69,共9页
The molybdenum carbide(Mo_(2)C)has been regarded as one of the most cost-efficient and stable electrocatalyst for the hydrogen evolution reaction(HER)by the virtue of its Pt-like electronic structures.However,the inhe... The molybdenum carbide(Mo_(2)C)has been regarded as one of the most cost-efficient and stable electrocatalyst for the hydrogen evolution reaction(HER)by the virtue of its Pt-like electronic structures.However,the inherent limitation of high density of empty valence band significantly reduces its catalytic reactivity by reason of strong hydrogen desorption resistance.Herein,we propose a multiscale confinement synthesis method to design the nitrogen-rich Mo_(2)C for modulating the band structure via decomposing the pre-coordination bonded polymer in a pressure-tight tube sealing system.Pre-bonded c/N-Mo in the coordination precursor constructs a micro-confinement space,enabling the homogeneous nitrogenization in-situ happened during the formation of Mo_(2)C.Simultaneously,the evolved gases from the precursor decomposition in tube sealing system establish a macro-confinement environment,preventing the lattice N escape and further endowing a continuous nitridation.Combining the multiscale confinement effects,the nitrogen-rich Mo2C displays as high as 25%N-Mo concentration in carbide lattice,leading to a satisfactory band structure.Accordingly,the constructed nitrogen-rich Mo_(2)C reveals an adorable catalytic activity for HER in both alkaline and acid solution.It is anticipated that the multiscale confinement synthesis strategy presents guideline for the rational design of electrocatalysts and beyond. 展开更多
关键词 molybdenum carbide Hydrogen evolution reaction Multiscale confinement synthesis Valence band modulation Nitrogen doping
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Mo掺杂FeS超薄纳米片电催化氮气还原合成氨的研究
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作者 张刚 范旭卓 +3 位作者 张鉴定 何雨晴 郑栋 程盛 《现代化工》 CAS 北大核心 2025年第1期100-104,共5页
超薄二维纳米片因其独特的尺寸依赖性而引起了人们的关注。然而,超薄纳米片合成方法以及纯的超薄片性能有待优化。建立了一种易于制备的不同Mo物质的量掺杂FeS超薄纳米片的合成方法,通过Mo掺杂FeS超薄纳米片调节活性位点的电子结构和环... 超薄二维纳米片因其独特的尺寸依赖性而引起了人们的关注。然而,超薄纳米片合成方法以及纯的超薄片性能有待优化。建立了一种易于制备的不同Mo物质的量掺杂FeS超薄纳米片的合成方法,通过Mo掺杂FeS超薄纳米片调节活性位点的电子结构和环境、缓冲多种反应中间体、促进N_(2)的吸收、降低电位测定步骤的能垒、加速催化过程来提高电催化氮还原反应(eNRR)的活性和选择性。结果表明,无贵金属催化剂Mo-FeS在eNRR中表现出高效催化性能,在0.1 mol/L Na_(2)SO_(4)、-0.1 V下(相对可逆氢电极)产氨速率为10.79μg/(h·cm^(2))。 展开更多
关键词 胶体合成 超薄纳米片 氮气还原 硫化铁 mo掺杂
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Thermodynamics and kinetics of adsorption of molybdenum blue with D301 ion exchange resin 被引量:12
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作者 赵中伟 许晓阳 +4 位作者 陈星宇 霍广生 陈爱良 刘旭恒 徐慧 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期686-693,共8页
The adsorption behavior of D301 for molybdenum blue was investigated.The thermodynamics parameters in adsorption process were calculated and the adsorption kinetics was studied.The experimental results show that the a... The adsorption behavior of D301 for molybdenum blue was investigated.The thermodynamics parameters in adsorption process were calculated and the adsorption kinetics was studied.The experimental results show that the adsorption characteristic of D301 for molybdenum blue fits well with the Freundlich adsorption isotherm equation.In the adsorption process of D301 for molybdenum blue,both the enthalpy change ΔH and entropy change ΔS are positive,while the free energy change ΔG is negative when temperatures are in the range of 303-333 K.It is indicated that the adsorption is a spontaneous and endothermic process,and the elevated temperatures benefit to the adsorption.Kinetic studies show that the kinetic data are well described by double driving-force model,and the adsorption rate of molybdenum blue on D301 is controlled by the intraparticle diffusion during the adsorption process.The total kinetic equation is determined. 展开更多
关键词 Ni-mo ore molybdenum blue ADSORPTION THERmoDYNAMICS KINETICS
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Extraction of molybdenum and nickel from Ni-Mo ore by pressure acid leaching 被引量:10
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作者 王私富 魏昶 +5 位作者 邓志敢 李存兄 李兴彬 吴钧 王明双 张帆 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期3083-3088,共6页
A direct hydrometallurgical route for nickel and molybdenum extraction from a nickel-molybdenum (Ni-Mo) ore using pressure acid leaching was studied. The nickel and molybdenum were extracted by acid leaching under o... A direct hydrometallurgical route for nickel and molybdenum extraction from a nickel-molybdenum (Ni-Mo) ore using pressure acid leaching was studied. The nickel and molybdenum were extracted by acid leaching under oxygen pressure. Compared with traditional roasting methods, this hydrometallurgical method eliminates SO2 and As203 emission (the Ni-Mo ore containing 15%-25% S). Compared with existing alkali leaching recovery of molybdenum process, almost all the nickel and considerable molybdenum were extracted in the acid leaching process. Under oxygen pressure conditions, almost all the nickel and a substantial part of the molybdenum were dissolved into the acid leaching liquor and the other part of the molybdenum was left in the acid leach residue. The acid leach residue was further leached under alkaline (NaOH) conditions. Under optimal experimental conditions, the extraction rates nickel and molybdenum reached 97% and 96%, respectively. 展开更多
关键词 nickel-molybdenum ore pressure leaching alkaline leaching NICKEL molybdenum
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Reaction mechanisms of low-grade molybdenum concentrate during calcification roasting process 被引量:6
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作者 甘敏 范晓慧 +6 位作者 陈许玲 吴程骞 季志云 王送荣 汪国靖 邱冠周 姜涛 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期3015-3023,共9页
The effects of Ca-based additives on roasting properties of low-grade molybdenum concentrate were studied. The resultsshow that calcium-based additives can react with molybdenum concentrate to form CaSO4 and CaMoO4. T... The effects of Ca-based additives on roasting properties of low-grade molybdenum concentrate were studied. The resultsshow that calcium-based additives can react with molybdenum concentrate to form CaSO4 and CaMoO4. The initial oxidationtemperature of MoS2 is 450℃, while the formation of CaMoO4 and CaSO4 occurs above 500℃. The whole calcification reactionsare nearly completed between 600 and 650℃. However, raising the temperature further helps for the formation of CaMoO4 but isdisadvantageous to sulfur fixing rate and molybdenum retention rate. Calcification efficiency of Ca-based additives follows theorder: Ca(OH)2〉CaO〉CaCO3. With increasing the dosage of Ca(OH)2, the molybdenum retention rate and sulfur-fixing rate rise, butexcessive dosages would consume more acid during leaching process. The appropriate mass ratio of Ca(OH)2 to molybdenumconcentrate is 1:1. When roasted at 650 ℃ for 90 min, the molybdenum retention rate and the sulfur-fixing rate of low-grademolybdenum concentrate reach 100% and 92.92%, respectively, and the dissolution rate of molybdenum achieves 99.12% withcalcines being leached by sulphuric acid. 展开更多
关键词 molybdenum concentrate calcification roasting reaction mechanism thermodynamic analysis phase transformation
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Separation of macro amounts of tungsten and molybdenum by precipitation with ferrous salt 被引量:13
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作者 赵中伟 曹才放 陈星宇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第12期2758-2763,共6页
In order to develop a low-cost approach for separating macro amounts of Mo and W, the effects of parameters on the separation using FeSO4 as precipitation reagent were studied. The results show that the optimum reacti... In order to develop a low-cost approach for separating macro amounts of Mo and W, the effects of parameters on the separation using FeSO4 as precipitation reagent were studied. The results show that the optimum reaction temperature is 10 °C, and the separation factor does not further improve after a reaction time of 7 h. Moreover, slow dropping speed of the precipitation reagent is beneficial for improving the separation efficiency. When the H+/W molar ratio is below 1/1, the addition of acid to a neutral solution is favorable to the separation. For the solution with an ammonium concentration below 3 mol/L, the separation factor is high due to the high W-precipitation rate. Furthermore, the method is also effective when it is applied to industrial solution containing some other impurities. All these indicate the ferrous salts have great potential for removing W from Mo on a commercial scale. 展开更多
关键词 TUNGSTEN molybdenum selective precipitation ferrous sulfate
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Separation of macro amounts of tungsten and molybdenum by ion exchange with D309 resin 被引量:14
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作者 卢晓颖 霍广生 廖春华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第9期3008-3013,共6页
Based on the difference in tendency to polymerize between tungsten and molybdenum, a new method using D309 resin was propounded. The batch tests indicate that the optimum pH value and contact time for the separation a... Based on the difference in tendency to polymerize between tungsten and molybdenum, a new method using D309 resin was propounded. The batch tests indicate that the optimum pH value and contact time for the separation are 7.0 and 4 h respectively, the maxium separation factor of W and Mo is 9.29. And the experimental resules show that isothermal absorbing tungsten and molybdenum belongs to Langmuir model and Freundlich model respectively, and the absorbing kinetics for tungsten is controlled by intra-particle diffusion. With a solution containing 70 g/L WO3 and 28.97 g/L Mo, the effluent with a mass ratio of Mo to WO3 of 76 and the eluate with a mass ratio of WO3 to Mo of 53.33 are obtained after column test. 展开更多
关键词 high concentrated tungstate and molybdenum solution ion exchange batch tests column tests
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Leaching of nickel-molybdenum sulfide ore in membrane biological reactor 被引量:1
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作者 陈家武 高从堦 +2 位作者 张启修 肖连生 张贵清 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第6期1395-1401,共7页
The bioleaching of molybdenum from its sulfide ore using a Mo-resistant thermophilic bacterium sulfolobus metallics combined with a membrane biological reactor(MBR) was studied.The experimental results showed that t... The bioleaching of molybdenum from its sulfide ore using a Mo-resistant thermophilic bacterium sulfolobus metallics combined with a membrane biological reactor(MBR) was studied.The experimental results showed that the concentration of Mo can be controlled by filter of the membrane in MBR and the toxicity of Mo to microorganism is decreased in the process of bioleaching.It was also evidenced that there were different leaching rates of Ni and Mo when the concentration of Mo was different.After leaching for 20 d in the MBR at Mo concentration of 395 mg/L,the leaching rates of Ni and Mo reached the maximum of 79.57% and 56.23% respectively under the conditions of 100 g/L of mineral density,65 ℃,pH=2 and 1.0 L/min of the aeration rate.While 75.59% Ni and 54.33% Mo were leached out in column without membrane under the same conditions. 展开更多
关键词 membrance biological reactor nickel-molybdenum sulfide ore sulfolobus metallics BIOLEACHING molybdenum toxicity
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Catalytic epoxidation of olefin over supramolecular compounds of molybdenum oxide clusters and a copper complex 被引量:3
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作者 高洪成 颜岩 +5 位作者 徐晓弘 于杰辉 牛会玲 高文秀 张文祥 贾明君 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1811-1817,共7页
The catalytic epoxidation of olefin was investigated on two copper complex-modified molybdenum oxides with a 3D supramolecular structure, [Cu(bipy)]4[Mo15O47].2H2O (1) and [Cu1(bix)][(Cu1bix) (δ-MoVl8O26)0.... The catalytic epoxidation of olefin was investigated on two copper complex-modified molybdenum oxides with a 3D supramolecular structure, [Cu(bipy)]4[Mo15O47].2H2O (1) and [Cu1(bix)][(Cu1bix) (δ-MoVl8O26)0.5] (2) (bipy = 4,4'-bipyridine, bix = 1,4-bis(imidazole-1-ylmethyl)benzene). Both compounds were catalytically active and stable for the epoxidation of cyclooctene, 1-octene, and styrene with tert-butyl hydroperoxide (t-BuOOH) as oxidant. The excellent catalytic performance was attributed to the presence of stable coordination bonds between the molybdenum oxide and copper complex, which resulted in the formation of easily accessible Mo species with high electropositivity. In addition, the copper complex also acted as an active site for the activation of t-BuOOH, thus im- proving these copper complex-modified polyoxometalates. 展开更多
关键词 Supramolecular compound molybdenum oxide cluster Copper complex Olefin Epoxidation
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Effect of Molybdenum Doping on Oxygen Permeation Properties and Chemical Stability of SrCo0.8Fe0.2O3-δ
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作者 宋春林 方曙民 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第4期445-449,J0002,共6页
The phase composition, microstructure, thermal expansion coefficients, oxygen permeation properties and chemical stability of SrCo0.8Fe0.2O3-δ (SCFM) were investigated and compared with those of SrCo0.8Fe0.2O3-δ(... The phase composition, microstructure, thermal expansion coefficients, oxygen permeation properties and chemical stability of SrCo0.8Fe0.2O3-δ (SCFM) were investigated and compared with those of SrCo0.8Fe0.2O3-δ(SCF). Single phase SCFM was successfully prepared by a combined EDTA-citric method. SCFM shows a lower thermal expansion coefficient (24× 10^-6-29× 10^-6/K) than SCF between 500 and 1050 ℃, indicating a more stable structure. SCFM shows a high oxygen permeation flux, although the oxygen flux of SCFM decreases slightly because of Mo dopant. Furthermore, it was demonstrated that the doping of Mo in SCF can prevent the order-disorder transition and improves the chemical stability to CO2. 展开更多
关键词 Oxygen permeation SrCo0.8Fe0.2O3-δ Chemical stability molybdenum
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基于熔盐堆尾气提取的99Mo生产评估
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作者 陈亮 朱贵凤 +3 位作者 王子业 严睿 邹杨 徐洪杰 《核技术》 EI CAS CSCD 北大核心 2024年第8期129-137,共9页
基于熔盐堆尾气提取99Mo同位素的生产方法引起了广泛的关注,但目前的工作局限于评估堆芯中99Mo的产量,对于其在整个回路中的迁移行为的关注不足。本文建立了一个熔盐堆中的贵金属迁移模型,并基于8 MW熔盐实验堆(Molten-Salt Reactor Exp... 基于熔盐堆尾气提取99Mo同位素的生产方法引起了广泛的关注,但目前的工作局限于评估堆芯中99Mo的产量,对于其在整个回路中的迁移行为的关注不足。本文建立了一个熔盐堆中的贵金属迁移模型,并基于8 MW熔盐实验堆(Molten-Salt Reactor Experiment,MSRE)进行了贵金属分布验证,而后对MSRE尾气中99Mo粗产品的产量、比活度及运行状态的变化对生产的稳定性的影响进行了分析。结果表明,尾气中的99Mo有较高含量和比活度,移除率增加的工况对99Mo的比活度的影响是有益的,空泡比例及氧化还原电势变化的工况对99Mo的比活度影响不大,该方法可作为一种潜在的99Mo生产备选方案。 展开更多
关键词 熔盐堆 医用同位素 99mo MSRE 核素迁移
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改性碳纤维-MoS_(2)复合涂层的高温摩擦学性能研究 被引量:1
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作者 高阳 刘思思 +2 位作者 廖君慧 赵鼎元 刘金刚 《摩擦学学报(中英文)》 EI CAS CSCD 北大核心 2024年第4期482-493,共12页
为了改善高温下固体润滑复合涂层的稳定性,选择经过化学改性的纳米碳纤维对MoS_(2)涂料进行性能优化,制备添加不同比例的改性粉末的涂料.通过对粉末进行XPS、红外和形貌分析,表明碳纤维已经改性.借助CFT-I型高速往复摩擦磨损试验机分别... 为了改善高温下固体润滑复合涂层的稳定性,选择经过化学改性的纳米碳纤维对MoS_(2)涂料进行性能优化,制备添加不同比例的改性粉末的涂料.通过对粉末进行XPS、红外和形貌分析,表明碳纤维已经改性.借助CFT-I型高速往复摩擦磨损试验机分别在不同温度条件下进行摩擦试验,利用超景深显微系统对不同条件涂层表面磨损的形貌进行观测,对磨损机理进行分析,探究添加量的最优比例.试验结果表明:在试验温度分别为20、50和100℃时,添加质量分数1.5%CF-GO(氧化石墨烯改性碳纤维)涂料制备的涂层耐磨性能均优于其他的添加比例的涂层.在干摩擦5 N载荷,试验温度为200℃时,添加质量分数1.5%CF-GO的涂层比未改性的涂层的磨痕深度、宽度分别减少66.1%、29.2%,涂层的耐磨性能有了很大的提高,进一步采用扫描电子显微镜(SEM)分析涂层的内部形貌可知,添加质量分数1.5%的CF-GO时,涂层内部形成清晰的网状结构,从而使得该比例下的涂层同时具有抗高温变形、耐磨以及耐热等优异的性能. 展开更多
关键词 改性碳纤维 二硫化钼 复合涂层 高温变形 摩擦学性能
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Mo添加对WC-Ni硬质合金微结构及性能的影响
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作者 徐涛 管一琦 +4 位作者 汤梅芳 龙坚战 曾瑞霖 崔焱茗 成祥 《硬质合金》 CAS 2024年第3期196-205,共10页
采用X射线衍射(XRD)、扫描电子显微镜(SEM)和性能检测等方法研究了不同Mo添加量对WC-Ni-Mo硬质合金的WC粒度、硬度、摩擦磨损和耐腐蚀性能的影响。结果表明:在研究的成分范围内(w(Mo)=1.5%~2.0%),WC的平均晶粒尺寸基本不随Mo添加量的变... 采用X射线衍射(XRD)、扫描电子显微镜(SEM)和性能检测等方法研究了不同Mo添加量对WC-Ni-Mo硬质合金的WC粒度、硬度、摩擦磨损和耐腐蚀性能的影响。结果表明:在研究的成分范围内(w(Mo)=1.5%~2.0%),WC的平均晶粒尺寸基本不随Mo添加量的变化而变化;随Mo添加量的增加,WC-Ni-Mo硬质合金的硬度略微有所下降,而摩擦磨损性能得到提升。Mo质量分数为2%的WC-Ni-Mo硬质合金在酸性溶液中的耐腐蚀能力要高于Mo质量分数为1.5%的合金,并且具有更好的电化学稳定性。总体来看,WC-8.0%Ni-2.0%Mo合金的综合性能优于WC-8.5%Ni-1.5%Mo硬质合金。 展开更多
关键词 WC-NI 硬质合金 mo添加量 晶粒度分布 摩擦磨损 耐腐蚀性能
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